How did Deidara get a mouth on his hand?

Answer 1

he was born with it! it must be a kind of kinjutsu coz when kakuzu repairs his arms his left hand which was destroyed by gaara has a tongue again....

well....it's me again...i think i was wrong about the whole kinjutsu think above or at least for the first part...Read...

"Before long, Deidara had an immense thirst to learn a form of art which was prohibited in his village. It is a form of [Art that requires the kneading of chakra into clay].He broke the law and attained the means of creating that form of art. He then made an explosion with his "exploding clay". At last, he can finally create the kind of [Art] that he had longed for. (Further explanation for clarity: Exploding clay is formed by infusing Chakra and clay together. In order to do that, Deidara needed to perform a forbidden jutsu on himself to get those additional mouths, which can infuse chakra together with clay. The jutsu probably gives him the ability to mix Chakra and clay together in his own mouth (the one on his face) too. So yeah, Deidara performed the forbidden jutsu on himself, and then attained the ability to create exploding clay, which made it possible for him to create explosions through his clay creations.)"...

That's an extract from naruto database III TRANSLATED. You can see the article about Deidei-san at. http://mangahelpers.com/forums/showpost.php?p=1071212&postcount=1

hope i helped...^\|

Answer 2

Actually, when Deidara was about 7 his older broth tricked him into participating in one of his parents experiments. Deidara had to hold fish jawbones and cow tongues in each hand. Then his brother drew the seal around him and told him to practice chakra control.

Answer 3

He has 1 on each and 1 on his left boob for his ultimate attack.